Resounding-board for accordions



n 3 A. FRONTALINI 2,122,094

RESOUNDING BOARD FORACCORDIONS Filed April 3, 1937 25' /f/L %om Patented June 28, 1938 UNITED STATES PATENT OFFICE Application April 3, 1937, Serial No. 134,877 In Italy January 11, 1937 2 Claims.

My invention relates to improvements in accordions, and aims to obtain a better soundin effect by the disposition of two double resounding boards. Resounding spaces have already been proposed for accordions inside the single chests bearing the metallic reeds, but as these spaces were hermetically closed and as their walls were not quite free for vibration the effect obtained was not satisfactory.

According to my present invention the two simple resounding boards,existing in each accordion between the chests bearing the reeds and the valves of the two sound boards, the one of which is for soprano voices and the other for basso voices, are doubled so as to form between them one large resounding chamber serving for all the voices of each sound board, this chamber having in one of the two parallel walls, connected and distanced by short pipes through which passes the air producing the sounds, a suitable aperture for the issue of the sound waves.

Other features of the invention will be explained in the following specification referring to the drawing which represents a form of execution of the invention.

Figure 1 shows in a perspective view and partially in section the sound-board for the soprano voices with the double resounding board,

Figure 2 shows in a corresponding view the sound-board for the basso voices,

Figure 3 is a transversal section through the chests bearing the reeds, through the valves and the double resounding board,

Figure 4 shows as a detail a peculiar form of the short pipes connecting and distancing the two walls of the resounding board.

In Figure 1 the numeral 1 indicates the chests of the metallic reeds 2. The chests are all airtight but removably arranged on the inner wall 3 of the double wall 3, 3, preferably of wood, the outer wall 3 being connected to and at the same time distanced from the inner wall 3 by means of the short pipes 4 of metal, wood, Celluloid or any other suitable material. The openings of the pipes 4 towards the outside are closed and opened by means of the valves 5, of which only one is shown in the drawing. One of the sides 3, 3' of the double resounding board is provided with an aperture 6 allowing the issue of the sound-waves. With 1 is indicated the key-board for the movement of the valves 6 of the sound-board for the soprano voices.

In Figure 2 are shown analogous parts of the sound-board for the basso voices, which are indicated by the same reference numerals. Instead of the flat keys I, the known cylindrio keys 1 of the basso are provided. In the space 8 is contained the mechanism for the movement of the valves 6.

In Figure 3 the chests I bearing the metallic reeds 2 are shown sectioned. All of these chests are mounted on a wooden base 9 and these bases are applied on. the board 3, 3.

In the figures from 1 to 3 the pipes are of a m cylindric shape. The Fig. 4 shows as a detail a pipe having a step and a prominent round border. By this variation a means for fixing the exact distance between the two walls 3, 3 of the double resounding board is obtained and also the valves 15 5 are distanced from the wall 3, so avoiding a contact between the valves and the resounding wall. This improves the resounding efiect. Furthermore, the small prominence 4' of the wall surface is an advantage in assembling this part with the base 9 of the chests I.

It will be understood that the drawing does not limit the scope of the present invention, which comprises on the contrary all of the modifications within the following claims.

What I claim is:

1. An accordion in which the two resounding boards, respectively for the soprano and for the basso voices, existing between the chests. bearing the reeds and the valves of each board are doubled 80 and form two large resounding chambers one for the basso voices and one for the soprano voices, each chamber having in one of the two parallel walls a suitable aperture for the issue of the sound waves, the two walls being connected and at the same time distanced by short pipes through which passes the air producing the sound.

2. An accordion in which the two resounding boards, respectively for the soprano and for the basso voices, existing between the chests bearing 0 the reeds and the valves of each board are doubled and form two large resounding chambers one for the basso voices and one for the soprano voices, each chamber having in one of the two parallel walls a suitable aperture for the issue of the sound waves, the two walls being connected and at the same time distanced by short pipes through which passes the air producing the sound, and which have a step for obtaining the exact distance between the two walls and a prominent border for improving the resounding effect.

ALFREDO IERONTALINI. 

